Maximum DW Spectrum Client Connections

DW Spectrum® Connection Restrictions

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Affected Roles:  Administrator, Owner

Related Digital Watchdog VMS Apps:  DW Spectrum® IPVMS

Last Edit:  October 28, 2021

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How many users can connect to a DW Spectrum Server?

The quantity of concurrent DW Spectrum Client connections that a DW Spectrum Server can sustain is limited by the number of active TCP connections that can be supported by the server.

With this knowledge, the Owner and Administrators should consider the number of desktop client instances that will be connecting to the system, how many cameras and devices will stream video in each instance, and if there are other servers merged with the system. This is to avoid potential bottlenecks that may occur due to exceeding the system’s overall capabilities.

**NOTE:  The numbers provided in this article is in consideration of connecting to only a single (1) DW Spectrum Server. In the case that a DW Spectrum System is comprised of a merged, multi-server configuration, consider the number of devices connected to each server.

Related Articles

• DW Spectrum Client Hardware Requirements
• DW Spectrum IPVMS Maximum System Size

Calculating the Maximum TCP Connections

For a DW Spectrum Server that is using the recommended system and hardware requirements, the average limit of concurrent DW Spectrum Client connections that can be supported is:

• One (1) DW Spectrum Server can support up to 2,000 concurrent TCP connections – including connected devices and camera streams, as well as connecting instances of the DW Spectrum Client for regular viewing

As the supported number of client connections to a server varies depending on the number of active TCP connections that are in use with the server, use the following information to calculate the number of active TCP connections of a server.

• x1 DW Spectrum Client connection = 5 TCP connections
• x1 Device or Camera connection = 1 TCP connection

Examples for a Single (1) Server

• 400 DW Spectrum Client instances can connect, but no video (0) can display for the users
  • (400 clients x 5 TCP connections each) = 2,000 TCP connections; the max. amount of TCP connections are being used
• 80 DW Spectrum Client instances can connect, but only up to 20 devices per client can stream video
  • (80 clients x 5 TCP connections each) + (80 clients x 20 devices) = 2,000 TCP connections; the max. amount of TCP connections are being used
• 28 DW Spectrum Client instances can connect, but only up to 64 devices per client can stream video
  • (28 clients x 5 TCP connections each) + (28 clients x 64 devices) = 1,932 TCP connections in use; 68 TCP connections are still available